/*****************************************************************************
 * bits.h
 *****************************************************************************
 * Copyright (C) 2001, 2002 the VideoLAN team
 * $Id$
 *
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
 *          Eric Petit <titer@videolan.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version       :   2 of the License, or
 * (at your option) any later version       :  .
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/
#pragma once

typedef struct bits_buffer_s
{
	int     i_size;
	int     i_data;
	unsigned char *p_data;
	unsigned char i_mask;
	unsigned char unused[3];
}bits_buffer_t;

static inline int bits_initwrite( bits_buffer_t *p_buffer, int i_size, void *p_data )
{
	p_buffer->i_size     = i_size;
	p_buffer->i_data     = 0;
	p_buffer->i_mask     = 0x80;
	p_buffer->p_data     = (unsigned char *)p_data;
    //p_buffer->p_data[0] = 0;
	if( !p_buffer->p_data )
    {
    	if( !( p_buffer->p_data = (unsigned char *)malloc(i_size)))
        	return -1;
    }

	p_buffer->p_data[0] = 0;/**/
	return 0;
}

static inline void bits_align( bits_buffer_t *p_buffer )
{
	if( p_buffer->i_mask != 0x80 && p_buffer->i_data < p_buffer->i_size )
    {
    	p_buffer->i_mask = 0x80;
    	p_buffer->i_data++;
    	p_buffer->p_data[p_buffer->i_data] = 0x00;
    }
}

static inline void bits_write( bits_buffer_t *p_buffer, int i_count, unsigned long long i_bits )
{
	while( i_count > 0 )
    {
    	i_count--;

    	if( ( i_bits >> i_count )&0x01 )
        {
        	p_buffer->p_data[p_buffer->i_data] |= p_buffer->i_mask;
        }
    	else
        {
        	p_buffer->p_data[p_buffer->i_data] &= ~p_buffer->i_mask;
        }
    	p_buffer->i_mask >>= 1;
    	if( p_buffer->i_mask == 0 )
        {
        	p_buffer->i_data++;
        	p_buffer->i_mask = 0x80;
        }
    }
}


